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US 8,478,342 B2Granted
Inter-cell interference coordination
AssigneeTexas Instruments Incorporated
InventorsRamanuja Vedantham, Sandeep Bhadra
Life of this patent
Estimating the term…
Abstract
A system and method for coordinating interference in cellular systems are disclosed herein. In one embodiment, a cellular base station interference coordinator includes an interference estimator. The interference estimator estimates a level of interference caused by transmissions controlled by a host base station for each of a plurality of radio resources, and provides interference estimates corresponding to the radio resources to a target base station. Each interference estimate is based on transmit power and channel strength to the target base station for each transmission controlled by the host base station for a radio resource.
Claims21
A cellular base station interference coordinator, comprising:
- an interference estimator that estimates a level of interference caused by transmissions controlled by a host base station for each of a plurality of radio resources, and provides interference estimates corresponding to the radio resources to a target base station;
- wherein each interference estimate is based on a transmit power and a channel strength to the target base station for each transmission controlled by the host base station for a given radio resource, and
- wherein the interference estimator compares a sum of products of the transmit power and the channel strength to the target base station for each transmission using the given radio resource to a predetermined threshold value to generate an interference estimate value for the given radio resource.
A cellular base station interference coordinator, comprising:
- an interference estimator that estimates a level of interference caused by transmissions controlled by a host base station for each of a plurality of radio resources, and provides interference estimates corresponding to the radio resources to a target base station;
- and
- an interference avoider that assigns radio resources to each transmission controlled by the host base station based on interference estimates received from a neighboring base station,
- wherein each interference estimate is based on a transmit power and a channel strength to the target base station for each transmission controlled by the host base station for a given radio resources, and
- wherein the assignment of radio resources is based on an interference value of each radio resource derived from interference estimates received from one or more neighboring base stations;
- wherein a radio resource having a lower interference value is given assignment priority over a radio resource having a higher interference value.
3 more elements
A cellular base station interference coordinator, comprising:
- an interference estimator that estimates a level of interference caused by transmissions controlled by a host base station for each of a plurality of radio resources, and provides interference estimates corresponding to the radio resources to a target base station;
- and
- an interference avoider that assigns radio resources to each transmission controlled by the host base station based on interference estimates received from a neighboring base station,
- wherein each interference estimate is based on a transmit power and a channel strength to the target base station for each transmission controlled by the host base station for a given radio resources,
- wherein the interference avoider determines a plurality of interference threshold values for sorting the radio resources, the interference threshold values based on a range of interference estimates received from the neighboring base station, and
- wherein the interference threshold values define a low interference tier, a medium interference tier, and a high interference tier of radio resources.
3 more elements
A method for coordinating inter-cell interference, comprising:
- combining, in a first base station, a transmit power and a channel strength to a target base station for each transmission using a radio resource;
- generating an interference estimate for the radio resource based on the combined power and strength;
- and
- providing the interference estimate to the target base station, wherein the combining comprises summation of products of transmit power and channel strength to the target base station for each transmission, and the generating comprises comparing a result of the summation to a predetermined interference threshold value.
1 more element
A method for coordinating inter-cell interference, comprising:
- combining, in a first base station, a transmit power and a channel strength to a target base station for each transmission using a radio resource;
- generating an interference estimate for the radio resource based on the combined power and strength;
- and
- providing the interference estimate to the target base station, wherein the assigning comprises selecting radio resources having a lower number of received high interference estimates for assignment to a transmission prior to radio resources having a higher number of received high interference estimates.
1 more element
A system, comprising:
- a first cellular base station comprising interference estimation logic;
- and
- a second cellular base station comprising interference avoidance logic, the second cellular base station being coupled to the first cellular base station for communication therewith;
- wherein the interference estimation logic is configured to estimate a level of interference caused by transmissions controlled by the first cellular base station for each of a plurality of radio resources, and to provide interference estimates to the second base station for each radio resource, each interference estimate being based on a combination of transmit power and channel strength to the second cellular base station for each transmission,
- wherein the interference avoidance logic:
- determines a plurality of interference threshold values for categorizing the radio resources, the interference threshold values based on a range of interference estimates received from the first cellular base station, and
- defines a radio resource low interference tier, and a radio resource high interference tier based on the interference threshold values.
4 more elements
A cellular base station interference coordinator, comprising:
- an interference avoider that assigns radio resources to each transmission controlled by a host base station based on interference estimates received from a neighboring base station;
- wherein the interference avoider is configured to accumulate interference estimates for each radio resource and to categorize the radio resources based on the accumulated interference estimates, and
- wherein the interference avoider determines a plurality of interference threshold values for categorizing the radio resources, the interference threshold values based on a range of interference estimates received.
Dependencies are inferred from the claim text.